Lanthanides & Actinides (1 janv. 1945 – 8 mai 1945)
Description:
In 1945 Glenn Seaborg identified lanthanides and actinides (atomic number >92), which are usually placed below the periodic table.Ajouté au bande de temps:
Date:
1 janv. 1945
8 mai 1945
~ 4 months and 7 days